Its actually surprising how much air is being pulled throught the stock tube running to the throttle body. I disconnected my air box from the hose todo some testing and theres alot of air being pulled thru there, I could just imagine what its like at higher rpms. So I would say get your self a CAI setup cause it'll be bigger in diamter and have better air flow. And btw.. having no air filter.. the car has quite a high pitch whine .. I can just imagine what it'd be like with a CAI.